Apparatus for simultaneous twisting and stretching, applicable to continuous machines for spinning carded wool



June 25, 1957 URRUTlA 2,796,725

APPARATUS FOR SIMULTANEOUS TWISTING AND STRETCHING, APPLICABLE TO CONTINUOUS MACHINES FOR SPINNING CARDED WOOL Filed July 23, 1953 VIIIIIIIIII/II/I 2 INVENTM TOM/4S URRUTI A United States Patent O APPARATUS FOR SIMULTANEOUS TWISTIN G AND STRETCHING, APPLICABLE T CONTINU- OUS MACHINES FOR SPINNING CARDED WOOL Tomas Urrutia, Mexico City, Mexico Application July 23, 1953, Serial No. 369,835

2 Claims. (Cl. 5751.4)

The present invention relates in general to the textile industry, particularly to the spinning of carded wool, and refers more particularly to a novel and useful apparatus for simultaneous twisting and stretching, applicable to continuous machines for spinning carded wool, said apparatus ofiering great advantages which those skilled in the art will readily appreciate and among which can be mentioned the following:

Through the adaptation or application of the apparatus of the invention, to a continuous machine for spinning carded wool, a fixed and constantly uniform twist is obtained, while in the systems used and known heretofore, one obtains a false and uneven twist which gives rise to breakages when a loose length of strand passes through the stretching cylinders, thus causing losses of time and a waste of material.

With the apparatus of my invention the strand can be stretched more than 50%, while in the known systems a maximum stretch of only 25% to 35% can be obtained, since the present apparatus can furnish an adequate twist at will.

The speed of production when using the present apparatus is over 18 yards a minute, whereas in known systems one can barelyobtain a maximum speed in the thread, of from 9 to 12 yards per minute.

When using this new apparatus, adapted to a continuous machine for spinning carded wool, one obtains, simultaneously with a fixed and uniform twist, a fine and uniform stretching which, as already indicated, allows a greater stretching than that available in the systems used and known heretofore, there also being obtained a larger production than with any of the latter.

These and other advantages, details, and features of the present apparatus for simultaneous twisting and stretching, applicable to continuous machines for spinning carded wool, will be made clearly apparent in the course of the following description as also in the drawings attached hereto in illustration thereof; like reference numbers serving in said drawings to indicate the same parts in the three figures shown.

In said drawings:

Fig. 1 shows a view in elevation and vertical section of an apparatus constructed in accordance with the invention.

Fig. 2 shows a plan projection of the same apparatus for simultaneous twisting and stretching, applicable to continuous machines for spinning carded wool, illustrated in the previous figure; and

Fig. 3 is an enlarged profile view of the guide piece which leads the strand toward the stretching rollers.

Before describing in detail the apparatus of my invention, I wish it to be clearly understood that the drawings illustrate solely by way of example the preferred form of carrying out the invention, without the latters being limited to the specific details illustrated and described. Recourse may therefore be had to such variations and/ or modifications as become or are judged convenient in practice, this naturally without departing from the princf] C ciples and sphere of the invention and always within the scope of the annexed claims.

As illustrated in the attached drawings, the present apparatus, applicable to continuous machines for spinning carded wool, comprises a tubular body 10 having an annular flange 11, by means of which it is attached to table 12 of the machine, as illustrated in Fig. 1 of the drawings. Inside the tubular body 10 there rotates a tightly fitted cylinder 13 which terminates, at its upper end, in a toothed crown gear 14, whereas on the lower part of said toothed crown gear 14 and on the flange 11 of the first cylinder or tubular part 10 there is an annular ball bearing 15, of the same diameter as said flange 11 although of appreciably less width.

Within the cylinder or tubular body 13 there is disposed another tubular body 16 which provides, on its upper edge and in diametrically opposed position, two perpendicular supports 17, each of which is provided with two bearings, one upper 18 and one lower 19.

On the inside of cylinder 13 and more or less at its -rnid-portion there is a step 20 which mates with step 21 on the outside of cylinder 16, for the purpose of maintaining the rotational stability of both cylinders or tubular bodies13 and 16 which rotate, the latter inside the former, as'shown in Fig. 1 of the drawings; the projecting portion or upper edge of the grooved ring, 22, fixed near the lower edge of tubular body 16, cooperating to maintain said stability. 7

Shaft 23 rotates on the lower bearings19 of the supports 17, said shaft having duly secured to its center a fluted or striated roller 24, said shaft also having secured to one of its ends a beveled gear 25 meshing with crown gear 14 of cylinder 13. Accordingly roller 24 hastwo movements, namely one circulatory movement of translation and another rotational movement on its own shaft 23.

On said roller 24 rotates another roller 26, secured to its shaft 27 that is journaled in the upper bearings 18, its purpose being to impart a given pressure to strand 28 (Fig. 3 of the drawings) which passes between both rollers 26 and 24, thus furnishing the required stretching together with an adequate fixed and, above all, very even, twist. The necessary pressure of the smooth cylinder 26 on the fluted cylinder 24 is obtained by means of the steel springs 29 (Fig. 1 of the drawings), housed vertically in supports 17 and pressing on the ends of shaft 27 of said roller 26. The pressure of said springs 29 is graduated by means of screws 30 which also are housed on the end or upper part of supports 17, so that springs 29 constitute a prolongation of its threaded portion.

On the upper edge of tubular part 16 is placed a rightangle support 31 (Figs. 2 and 3 of the drawings), the horizontal arm of which extends to the center of said tubular body 16 and precisely on smooth roller 26 and P therefore on striated roller 24, said arm engages guide piece 32, which is a small funnel the lower part 33 of which (Fig. 3 of the drawings) continues forming an inwardly curved channel fitting the curve of the surface of the upper roller 26, so that it leads strand 28 between the two rollers 26 and 24 for the twisting and stretching thereof, and which can be placed at either side of the rollers, accordingly as the rotation thereof is in one direction or the other. Likewise, close to the lower edge of tubular body 16, there is another guide piece 34 which similarly reaches the central portion of said body. This lower guide 34 consists simply of a wire spiral, through the convolutions of which the twisted thread 28 passes to be delivered to the spindles on which it is given the final and definitive twist.

Grooved rings 35 and 22 are semi-fixed and are placed on cylinders or tubular bodies 13 and 16, respectively, for the purpose of rotating them by means of V-shaped drive 3 belts (not shown in the drawings). Said belts are driven by respective pulleys situated on the shafts of the continuous machine and which are not illustrated as they do not form a part of the invention. 7

Cylinders i3 and 16 are driven independently with regard to each other, for the purpose of imparting to strand 28 the required degree of twist, wherefore said cylinders or tubular bodies 13 and 16 rotate at different speeds.

The rotational movement of drive shaft 23" and, accordingly, of striated cylinder 24, is transmitted to shaft 27 and to roller 26, by means of the toothed wheel 36, fixed to the end of said shaft 23, which meshes with toothed wheel 37 secured to' the corresponding end of shaft 27. Generally toothed wheel 36 of drive shaft 23 will be larger in diameter than gear 37' of shaft 27.

Having thus described the invention, what I consider as new and desire to secure by Letters Patent is:

1. An apparatus for simultaneously pulling and twisting carded wool and for use with continuous machines for spinning carded wool, comprising a support, a first cylinder mounted on said support for rotation about a vertical axis and having a ring gear and means for driving said cylinder, a second cylinder rotatable concentrically within said first cylinder and having means for driving it independently of said first cylinder, said second cylinder having two pairs of axially spaced, diametrically disposed bearings, a first cross-shaft journaled in the lower pair of said bearings and having a gear at one end in mesh with said ring gear whereby said shaft is driven by relative rotation between said cylinders, said cross-shaft having a first spur gear fixed at the other end and-a roller fixed centrally thereof and having a longitudinally corrugated or serrated peripheral surface, a second cross-shaft journaled in the upper pair of said bearings'with said upper bearings accommodating movement of said second crossshaft axia ly of said cylinders toward and from said first cross-shaft, said second cross-shaft having a second spur 4 gear at one end in mesh with said first spur gear and a roller having a smooth peripheral surface fixed centrally thereof and having gravity peripheral engagement with the periphery of said corrugated roller, means on said second cylinder for guiding carded wool between said rollers axially of said cylinders to be pulled and twisted by said rollers as said cylinders and rollers are driven, and spring means on said second cylinder adjustably tensioned on the ends of said second cross-shaft and biasing said smooth roller onto said corrugated roller to supplement the gravity pressure of said smooth roller on yarn between said rollers while accommodating variations in the thickness of such yarn.

2. An apparatus according to claim 1 wherein said guide means includes a cylindrical guide centrally of the lower end of said second cylinder for guiding the spun wool from said rollers, and a funnel-like guide centrally of said rollers for guiding. carded wool to said rollers, said funnel-like guide including a straight entrance portion above said rollers axially of said cylinders and a curved portion leading from said entrance portion and closely surrounding one side of said upper smooth roller and terminating in a restricted outlet at the nip between said rollers to deliver the carded wool directly between said rollers.

References Cited in the file of this patent UNITED STATES PATENTS 1,798,905 Schneider Mari? 1, 1931 1,926,288 Koch Sept, 12, 1933 2,152,295 Weinberger Mar. 28, 1939 FOREIGN PATENTS 194,326 GreatBritain Mar. 15, 1923 351,100 Great Britain June 25, 1931 864,057 France Apr. 17, 1941 

